[time-nuts] NIST

Poul-Henning Kamp phk at phk.freebsd.dk
Thu Aug 30 18:18:12 EDT 2018


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In message <96e995c4-5ca2-af02-9738-0a6d87a9f813 at pacific.net>, Brooke Clarke writes:

>But it's extremely hard to make a jammer for WWVB (60 kHz) [...]

You can do it city-scale with a 18-wheeler sized loop-antenna
and a good size diesel-generator.

However pedestrians will very likely note metalic items vibrating
as they pass the "mystery white truck".

Sweden were much more serious about it:

	http://www.antus.org/RT02.html

Tl;drs:

They erected 9 200m tall Loran-C class antennas each driven by
a Loran-C transmitter with an advanced degree which could jam
Loran-C or Chayka.

They even mounted decoy parabolas on the towers them to hide their
true purpose.

The fact that all the transmitters were on the east coast does drop
a hint that swedens much touted neutrality had a bit of a slant.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.



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